lunartime.org

Organization

International Astronomical Union

Astronomical union whose 2024 General Assembly adopted the resolutions on the Lunar Celestial Reference System and Lunar Coordinate Time.

At a glance

Every value in this table comes from the entry in our organizations registry; the links below lead to the pages it connects to.
FieldValue
Short nameIAU
TypeScientific union
BasedInternational
Address we linkwww.iau.org
TrackerInternational Astronomical Union
Documents on this site2 documents
Papers on this site2 readings
Facts on this page4, each with its own source

Key facts

  • Resolution II of the 2024 General Assembly establishes the Lunar Celestial Reference System (LCRS) and Lunar Coordinate Time (TCL). [1]Official
  • The same resolution fixes the epoch: TCL reads 1977 January 1, 0h 0m 32.184s exactly when TCB reads that value at the centre of the Moon. [1]Official
  • Resolution III asks international organizations to agree the relations between a lunar reference time scale, a lunar coordinate time and UTC. [2]Official
  • Coordinate time is not read by any real clock, so the two resolutions define a scale without realizing one. [2]Official

In short

The IAU is the one body on this page that has already acted. Its 2024 General Assembly adopted Resolution II, which establishes the Lunar Celestial Reference System and Lunar Coordinate Time (TCL), and Resolution III, which asks international organizations to agree how a lunar reference time scale, a lunar coordinate time and UTC relate. A coordinate time is a definition, not a reading: no clock produces TCL directly.

Every clock value on this site is a model value computed from published rate figures: no lunar time scale has been realized, and nothing on this page is a reading taken from a clock on the Moon[2]Official. The record itself sits inthe list of organizations, and the wider background is inwhat Coordinated Lunar Time is.

What it decides

  1. The definition of the lunar coordinate time other bodies build on, and the epoch it starts from.
  2. The reference system in which lunar positions and clock rates are expressed.
  3. Which question it hands on: the practical scale and its relation to UTC are asked of others.

Where this record connects

Documents

Papers we have read

On the tracker

Other organizations

Sources

  1. Resolution to establish a standard Lunar Celestial Reference System (LCRS) and Lunar Coordinate Time (TCL) — International Astronomical Union, Commission A3 — XXXII General Assembly, . Official document. Verified .
  2. Resolution on the establishment of a coordinated lunar time standard by international agreement — International Astronomical Union, Commission A3 — XXXII General Assembly, . Official document. Verified .
  3. International Astronomical Union — International Astronomical Union, . Reference. Verified .

Last verified